P185B
DTC P185B: Disengagement too late with clutch 2CAUTION
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
DIAGNOSTIC FUNCTION
TC-SST-ECU checks that the clutch 2 is normal.
DESCRIPTIONS OF MONITOR METHODS
The disengagement of the clutch 2 is determined to be late.
MONITOR EXECUTION
^ Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0846: Clutch 2 pressure sensor system (Poor performance)
^ P0847: Clutch 2 pressure sensor system (Output low range out)
^ P0848: Clutch 2 pressure sensor system (Output high range out)
^ P1844: Shift fork 3 malfunction
^ P184B: Shift fork 4 malfunction
Sensor (The sensor below is determined to be normal)
^ Clutch 2 pressure sensor
LOGIC FLOW CHARTS (Monitor Sequence)
DTC SET CONDITIONS
Check Conditions
^ Voltage of battery: 8 V or more.
^ Voltage of battery: 16.5 V or less.
^ Engine speed: 650 r/min or more.
^ Time since above engine condition: 1.5 second or more.
^ Clutch 2 (even) state: Disengaging.
JUDGMENT CRITERIA
^ The disengagement time of the clutch (depends on the fluid temperature) is outside the threshold value.
OBD-II DRIVE CYCLE PATTERN
The disengagement time of the clutch (depends on the fluid temperature) corresponds with the threshold value.
PROBABLE CAUSES
^ Malfunction of TC-SST-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P185B set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction.)